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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da170ce1fab9c58b2da7a0b883e90029ed9762c7dddfc3339aecfb61398641c' 
  AND token = 'jwDNOkQDBAPD1ww4v3nleYj2h87hzXhu8eO+MSXgpS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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