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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c630eb856598e88c0bfb2e7605a994766f5bd18ffc69af5a4feb8bfdaef55c' 
  AND token = 'NnFWHhv5/HLCUpR11I6Yv7lgw7oObTK+O0rmlYzf0Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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