SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e33abb521c72a5a42e41f257453b6923d8742db9a60cad487565430a3d61d8' 
  AND token = 'FTtG/7IypZg+js5FXDuNdZRxXz8JHjDsJHbiIV/tH4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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