SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4c692c87a69c22500a415d81b3f552793cbdeca75991c31ed79b9c4351a964' 
  AND token = '8rvQZZXWYqu3xcEVco5TABvonuY+F/tJKzVx2ol/vOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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