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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdffeaf01d0fb271156b3a1605ce3f9ed01ea151f5010d7a087a4791a24e8f87' 
  AND token = '8wUwldkhPunVGDYoMaaFEhWeAQNw+bJuT8m4uGdC8M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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