SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ec90f9445750cc478bab95eb63fb54e722c572a349b385bad1dab363ef26fe' 
  AND token = 'HmJjnLMAYRCF+IwkTLjc/r5973v6Thphl2GVqavZXVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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