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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f6f9aab13cc634409f00b983378af81507bf4e94f33d7d6fafd65c85ea4dbe' 
  AND token = 'swJgqK6zlb6233EDHo+DtjW/0KiAPbX6lLcqt5aIDW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}