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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3424c9fdcb6c0006d87e11b11567fd1caf785b9f616ea49031a3017d316cbc59' 
  AND token = '1P3e9hWBSXnRIxY0fYx6aGXk8me3xIddMJSiO8UbkqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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