SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1531d60f8e6602a88b6c9caf3ec110abe941c62898274e873c24c04ca261fd7c' 
  AND token = '+D+V5eIkQ997nK0DW78ON85pOSOAOk78adtGx1TF0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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