SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c747ac6c142e5a2df88106739ea68b11f308dfdd3f2f36b396879fef248f4c' 
  AND token = 'B7PKrnFJxSkgztXHbnXIML4QhBUr8gT3Q/M4Z9G850w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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