my %z=(aa=>{bb=>{cc=>44}});;

sub chk{
   my ($v,$h)=@_;

  return 1 unless @$h;
  return 0 unless exists $v->{my $x=shift @$h}; 
  return chk($v->{$x},$h)
}

print qq[found\n] if chk(\%z,[qw(aa bb cc)]);