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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525d56675704aab71357560dafaa000221a11f8238480a2478a5456ca5484452' 
  AND token = 'pdVmS+udRiM1iYVLWyS+AVtrKvu0+ie/MVsn+T+e480=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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