SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4e67c9cb078a6003f63655774f9c37706a288580fdc37369b41bc91fb5fdd0' 
  AND token = 'GynUdr/w4GKqjmvxbnmfOP8iAaVcGQ+h4T1uxa2XgLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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