arangosh> db._query(
........&gt; <span class="hljs-string">'FOR c IN @@collection FILTER c._key == @key RETURN c._key'</span>, {
........&gt;   <span class="hljs-string">'@collection'</span>: <span class="hljs-string">'mycollection'</span>, 
........&gt;   <span class="hljs-string">'key'</span>: <span class="hljs-string">'testKey'</span>
........&gt; }).toArray();
[ 
  <span class="hljs-string">"testKey"</span> 
]