SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01472b81cd4e1b2e73efec83ad5b89cfd99f0a05f8ea6d8621fb79908434098f' 
  AND token = '2+OjJhFSu3qFYqVurZclPkyms1IUSqmiqhD+N9yvvpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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