my %possibleArgs = (
    1 => 'NEW',
    4 => 'PND',
    9 => 'CLS',
);

my @args;
for ('col1', 'col2', 'col3') {
    if (exists($possibleArgs{$_})) {
        push @args, $possibleArgs{$_};
    }
}
$extraqueryarg = "and table.column in (" . join(',', @args) . ")";