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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fada01b874e68e3d91c2f3f010b52a9d67c86ecd8bb14e5b67ba7a467f174ef6' 
  AND token = '9y5PB3XhkHJ5520wz1EqFJ1unMk+rW+9XI+dXpji/fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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