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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc17d7bdc7fcb93cea27e9c769d0c73f868a9f1d9696eb3dc3178100fc794a8d' 
  AND token = 'Mt6goffo5EfDyAGt+ZsrQ/40LTpaBo213jsE4FaUNeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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