Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b270bbaf626cbf468e11251c04d1a6e71afb2691ead5e3d00ab60ac618146e4' 
  AND token = 'BH+Vd3Fl68B1pKvXDvK9TPfPQ0aJ56uK+26ZThab1wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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