getting variable data outside subscribe method

I am trying to implement canActivate for user routes, before that I want to check whether the access token is still valid or not. Therefore I implement something like this

export class AuthGuard implements CanActivate {
  data:Array<Object>;
  constructor(private base: BaseService){}

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): boolean {

    var session: any = { token: localStorage.getItem('abc') };   

    this.base.valid(session).subscribe(result => {
      this.data=result;
      console.log(this.data); <-- first 
    });

    console.log(this.data); <-- second
    return true;
  }
}

here I can get the data variable inside the subscribe method when I console it but outside this method is give undefined value. How can I access it outside the method.