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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf32c0a1665a2c84633bfca36ac3906de5d054a6ae791757a8feeb8162ca1ea' 
  AND token = 'N6tTZlWX9jZeTzcBF4qnJRP5HFWRJT4fyghmAi7G6kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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