SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee4457c0b7ae7c9cd5a06135227c105dd283547f4f5fd8713e0d4c7256a4fff' 
  AND token = 'v2YKhZdTVoGEF8+NBufJX1FQwTiNeKzPRsKwlNY9pMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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