SQLite how to read a specific row using PHP PDO

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PHP

SQLite

Here is the table:

Name: "TagValues"
Column1: "Tag"
Column2: "Values"
No Of Entries: 80

What is the query to read a specific row with a Tag value "CustomTag" I Tried these

$UserTag = "CustomTag";
$query = "SELECT Tag FROM TagValues WHERE Tag='$UserTag'"; //it didn't work
$query = "SELECT FROM TagValues WHERE Tag='$UserTag'"; //it didn't work
$query = "SELECT * FROM TagValues WHERE Tag='$UserTag'"; //it didn't work

Whats is the exact syntax?