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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b939e8ad17b72a55d75612c7942e18d9a5745ce70ce8358915cc1e353ed4e3d8' 
  AND token = 'kSMjAZRUrI8bniC/Euf6uoL33JBtyJ4EZ+JuvaeWviE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}