Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03c6401cd4461e809c0960e95a6d8c5394bc85b974fbbf518a3dd049a5db450' 
  AND token = 'nsmGbPPCloHehq7VJSY66fWQeglh5xjn4ElT2NuuAbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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