SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd416c6005ac294d3b92b460e06e0fe3e1f60f488b101bf43ec2bfc51423c186' 
  AND token = 'E8XGzxHxX/wIvVsdHeyZOl3qXKVoWq/a9jhlkTv5pUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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