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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd4949c5aaa00ffef439330d73ed9514cf32324b3b7842764f03420327f771b' 
  AND token = 'WfNW0gd8qqF4+OAX2gLF8/O7Za8/TWOLK70Xg9riM8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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