SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332b2b788529456f146fb1d94949588f8f34671f716e589e9a3d62ede72ca34d' 
  AND token = 'FANAJnNNz/8+ig0Cu1nunEKXqFYAg//94bixUcYGKCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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