SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6565ddfffd6417ef862624bf55cb355e647ad0ad09d0ca1bb6ef1aadcc95cab5' 
  AND token = 'X8eOhC/w7SpM8Ky1+vBg19o+OYzG7UJsQU0bb9jFwIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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