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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a8c67b45c70657a481bb10ae92dced4789b11cb7ea6b588a86bea14a9b3f39' 
  AND token = 'GBOxUdQ0deG4uo9R2Jjtclj4qd9QnI80skfPVt5MAr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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