SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057c98fdde58b75ba53d826d9bdd1902246b0644a7609a277dba393138560406' 
  AND token = 'c5X7APJKDgZf+Ur/kPOvkJbdcfsbwUZLIJkh4CNcjLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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