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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b624f0739934c4f9c2dd32854723b8a5228236b0ae4f8b0bd0e5e960b7c6ac' 
  AND token = 'tqRVXK/QE95/cUfFjDOStwbzYUcoe9Wybqd1yOjdi2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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