SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ca35acaf79fd9320b254cbad29bc6870dfb90d149c836c541bd8d7372007ab' 
  AND token = 'sF8W5Dx5MXGe6r30Hww09YjjxhzPlBEFgvUvMqgd6Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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