SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618941eb4d5332ecb8f18459ae6da5ece7a9e14187b0a64b750960f43f187fee' 
  AND token = 'qS8MafzJ4RNpvaZYZnvaQxK2ZWEjPnEFXhQqBq2KLk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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