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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1731ec133847b1351b533b6dab3ab43cf06389342d89fb15f2cb6ed12b5356c9' 
  AND token = 'n7asIyiIeul4THcrJDETHporx9prC3zOfgSJ76X42yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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