SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e721cfbfb56963278341ce8d4306d3656acfce959e133046701f49b5d6a005a3' 
  AND token = 'BEyBNPAhVRVZXeTYx9hbSgcnl5pQWFC3YWgkK09Gjow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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