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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9735e904110d0e9b5beb5c4fbae99d163fde72d8cad20b331b2ae25fb2504214' 
  AND token = 'dXYWaQBmrJfRWNsOlnVcdb7K4F8J9Wvom8pwLYuqQwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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