SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3629400131a340e607a2dd88cd326c5f1b7de85797be96d463259911049596c' 
  AND token = 'gyuBhYaarkzLhrfiYV0t/kLd0HJqwzs0tZn+j+8Ktgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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