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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb34e23f78d23a83d67cc5f32cb87d6ee2917ced3b6c1c4b7360fae9eb64ae8b' 
  AND token = 'Q+SqsnwMbVnNx1+sPwLMlyuergspwZbzfIkvVhqLhzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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