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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392f350606bd68b7793d58a8c7fe78e219744322ddacd3a91af8e99bc4f7f63c' 
  AND token = 'jddEq6OkGj0nTKV3w0wet1bdBd6b94E2Z7xf01x7Il4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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