Check item exists based on a column value using REST API

<script type="text/javascript">
function PreSaveAction() {
var result = false;
var value=$("select[title=MyColumn] option:selected").text();
var requestUri = _spPageContextInfo.webAbsoluteUrl + "/_api/Web/Lists/getbytitle('MyList')/Items?$select=LinkTitle,MyColumn/Title&$expand=MyColumn&$filter=MyColumn/Title eq '" + value;
$.ajax
({
url: requestUri,
type: "GET",
cache: true,
async: false,
headers:{
"ACCEPT": "application/json;odata=verbose"
        },
success: function (data) {
if($(data.d.results).length == 0)
result = true;
else
alert("Retry!!!");
},
error: function () {
}
});
return result;
}
</script>