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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4618fb06c4577a3d4cb47cf26577e875ad4738635c87f9a9c0ecb831f1efb60' 
  AND token = 'BriD0WyXy5hK49SDwFYVOpNy/A1lX3kfZNxJk/O3D1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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