codeigniter select for update
$table = "my_table";
$id = 1;
$update = ["status"=>"working"];
//Edit just above / if you don't need extra "where" clause
$query = $this->db->select()
->from($table)
->where('id', $id)
->get_compiled_select();
$data = $this->db->query("$query FOR UPDATE")->row_array();
$this->db->where('id', $data['id'])->update($table,$update);