SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3b44054e990596d5d62427374e2a3cf29f246763bcec163dceca3275364149' 
  AND token = 'GutaBwYgTdqzgnBmjC/QcCaDXPpOTUDbPVXWeNhgGRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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