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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e3d9e2b3f107202a72f41d75e36be5ebda1a31b22576d6ead8c6864c387f0d' 
  AND token = '1W2byjz1NNp4woUj07rodgT8boHagFuDWaPoURXkzUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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