Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1776b00d1b850c9718dc2109b06db4be7fcb266ee20ada81b07fed755362a27' 
  AND token = '292gBgT6O5fLB075ngGblcEkxE3Vo7DrLZ1m0azdym4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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