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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5303fe0738e27ba938619fe08ae395abed818bc024c600b9c6523f05598dc5f5' 
  AND token = 'wtzpRwoOUbjskYeMCDFi6sd1ZVIewfU6wL7JZZgkOLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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