SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04efd934a9dbcaa9e6c0ecb23c0bd702b2822c31d3288e737aa925ff80f1bad3' 
  AND token = 'wDRm9yKv/SPSQmpNrIOGVJOw/EGl66JDYjKYhWiz+lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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