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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9c7a90161680dff4a29f9c3097f746ace1fd5e87176a59eda6a221e28e9ad3' 
  AND token = 'UgD8v3/uCLcFbbOMOd5FQLQpa6x2Rg68rP+Y1qGoHaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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