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我有來自不同來源的客戶和銷售線索，我需要弄清楚客戶是否已經註冊爲銷售線索。MySQL數據匹配：更好的選擇？
我使用的匹配12個字段：
address1_clear
address2_clear
address_clear
contact_name_clear
email
invoice_mobile
invoice_phone
mobile
name_clear
phone
phone2
taxnum
（_clear後綴意味着數據是在小寫，W/O空格和標點）。
- 線索 - 300K記錄
- 客戶 - 500K記錄
- customers_leads - 460K記錄
這是用來進行匹配查詢：
SELECT l.id as lead_id, c.id as customer_id FROM lead l
INNER JOIN sync_settings s ON s.account_id = l.account_id
INNER JOIN customers c ON c.setting_id = s.id
LEFT JOIN customers_leads cl ON cl.customer_id = c.id AND cl.lead_id = l.id
WHERE cl.lead_id IS NULL AND
(
(l.phone IS NOT NULL AND l.phone IN (c.phone, c.phone2, c.invoice_phone, c.invoice_mobile)) OR
(l.mobile IS NOT NULL AND l.mobile != "" AND l.mobile IN (c.phone, c.phone2, c.invoice_phone, c.invoice_mobile)) OR
(l.invoice_phone IS NOT NULL AND l.invoice_phone != "" AND l.invoice_phone IN (c.phone, c.phone2, c.invoice_phone, c.invoice_mobile)) OR
(l.invoice_mobile IS NOT NULL AND l.invoice_mobile != "" AND l.invoice_mobile IN (c.phone, c.phone2, c.invoice_phone, c.invoice_mobile)) OR
(l.email IS NOT NULL AND l.email != "" AND l.email = c.email) OR
(l.taxnum IS NOT NULL AND l.taxnum != "" AND l.taxnum = c.taxnum) OR
(l.contact_name_clear IS NOT NULL AND l.contact_name_clear != "" AND l.contact_name_clear = c.contact_name_clear) OR
(l.address1_clear IS NOT NULL AND l.address1_clear != "" AND l.address1_clear = c.address_clear) OR
(l.address2_clear IS NOT NULL AND l.address2_clear != "" AND l.address2_clear = c.address_clear) OR
(l.name_clear IS NOT NULL AND l.name_clear != "" AND l.name_clear IN (c.contact_name_clear, c.name_clear))
)
它是超重型，響應時間是~4分鐘。由於OR和附加條件，索引沒有多大幫助。
我想知道：有沒有更好的方法來做到這一點？也許使用一些NoSQL數據庫基本上構建一個巨大的散列表或一些數據匹配技術，我沒有能夠谷歌？
P. S.我知道我可以製作單獨的表格來純粹匹配字段，它會更快，但我仍然想知道我的替代方案。