SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96930586595e57cc8ba7874b667151b41cf3ce65e0f41bf3b7d834c19c91281b' 
  AND token = 'qM3szORwiQJLen2rWcBA2fBljDvarW+79fFK4EhQ4GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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