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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69849bf9611e0773c5e0d5c8978ad7f614ec22f8cc9a674f4e158d17b8f68cf' 
  AND token = '2LzMFzhWtQBiya86JsIOfj+hBXPprCvsfWxo1tEA9hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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