SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67931751f03c2dd2885066fb06a5382055c0b14e5a045d222fbe7b37b72d9ac9' 
  AND token = 'kPEmRf+OoGg9CGJZ7W1VG6H8I4B3SapirUU2RBh+/gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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