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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b815b223fefcca7be87f6f69db4049a3b2f88f93d57f65c82dba276c230fb99' 
  AND token = '5ABW7y6Q04PgvkZd93lD9ciBUSZHYjM9xuug497LD+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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