How can I optimize this SQL query with ORDER BY RAND()?

You may be better off adding a non-unique index which includes the fields seller. Admin_status, seller. Pay_status, seller.

Sub_type . You'll get the biggest bang for your buck by indexing fields referenced in your WHERE clause.

Serious load is being caused by your SQL because of ORDER BY RAND(). You can google for reasons why this is a problem, and suggested fixes on how to accomplish the same effect in other ways.

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