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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87f5af926bdf6642ee79e8097cb53d0639dff8e55c5f041b8b8db3aa688d2ad' 
  AND token = 'kM6qX7FL1WNzJamEYutuMLTgk+LbZPtHgx4SJ14ZKi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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