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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1aeb8298f1922b28e2c7676f86ff00cef1726100328bfb23ace3d744c32eaf' 
  AND token = 'gP3iXfTs9s9MOHfAUpaTJJ8z5IW08v3hRkJNCHTQNcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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