Getting the customer id if session is not set

Hi, sorry for lots questions on auto logins I am just new at that.

I am creating a auto login for my front end system. When the session has expired it unset the customer id.

I use my readAutologin function to see if any rows return with customer id. But because it does not exist in the session or cookie I do not no the better way of being able to get customer id for my readAutologin

My cookie data only has tokens it has no customer id's

PHP Code:

public function readAutologin() {
$this->CI->db->where('customer_id', '1');
$query = $this->CI->db->get($this->CI->db->dbprefix . 'customer_autologin');

if ($query->num_rows() == 1) {
    return $query->row_array();
} else {
    return false;
}

} 


I was thinking instead of

PHP Code:

public function readAutologin() {
    $this->CI->db->where('token',  $this->CI->input->cookie('remember'));
     $query = $this->CI->db->get($this->CI->db->dbprefix . 'customer_autologin');
     if ($query->num_rows() == 1) {
            return $query->row_array();
      } else {
            return false;
      }
} 


What is your suggestion?

There is no encryption at the moment I am just playing around to it working?

Full Code Here

There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!