SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6264788992a665d20121c4a52dcbbc813b1191b93e05f9cc7e3f613d651e84' 
  AND token = 'msjorzGXhlk/KeCeaQ2VKXdC6gkBLKzUfxyiWtXZLdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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