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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064247ee33646b352c9cd03d570c4afce6f009a7697d7bd802626a6e2fe39e90' 
  AND token = 'IexdF+iC0y6BkfACogFIsEyWiEZx1mxLu8YaYdnit6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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