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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ad3db29ba7632ba51894931ecd8f6bd71f32eed16068a7bf36bad83a72f0d8' 
  AND token = '9QLnUezTemxY0aRWQeOfuu9xUDKt1cZYxq5YlMtQR8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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