Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266417b6d71fe1dc538a00c19b56a85fa2bfcf9e72afa92e3fb1a84ceed3b501' 
  AND token = 'LJmV/8rFQfTSFSFmfS9xp4TcM/k36sKYxfRKpVGvHlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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