Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f51bed40af0dd3be3a7963ece1206ecb0976756d40443d71eb67558a55231a' 
  AND token = '+T08hwOmGE3CKEczQZptBi5rrHX4rEgrYiC5Cscucs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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