SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362fc7ad30f9b2b4476931b08f527462182cae1dc5e63b118ea3a59c50d1faf4' 
  AND token = 'aR7vwGwGvrLJiOk7y7xboaPjjJknYVqhfxHanB/svNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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