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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff3c27afb17f9be7b521b05556d3d6be6f4121a29acb65ebb601c23db3b9283' 
  AND token = 'suddRDbXjCzGo/uet3eVuUAUDt+xKLqw2VlFhkFOZtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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