SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89348291ec5c1204dacc8e7644b58a724775d270539d7086f3cf9ac47d07fb2' 
  AND token = 'vF2w3NTzBDYkFRxY3/TqLlVUKIyFFDS/CakIQjLp2nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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