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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b886c939ccb2c2f4289f136a85c7e9c4fc8f73f609ac98dd44648921f685fe10' 
  AND token = 'yFhJgORZBpXS02oH1JPAmcmO3U7raVePQgOLkbSh80M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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