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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a41d1dce801680c0a5864ba5b8cd8c4b70a7932597040feb771bed69caf0a9' 
  AND token = 'Pq6qxhmHdFvmxQJVUJdTfoll0VgiZNFE6ZwVUCVV1xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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