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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a3887a1409bdaac96130702700ba6600b7656475c9b0978f137575b38a94d4' 
  AND token = 'QMJQWu1x8YSYKlh/WQx+18gUzEMSL/zw0aqSUkAvMaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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