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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0601b5ab7a8c63db320f417040eb324e02efb8a247f80c4eeba779cd1393e48' 
  AND token = '9ZtFHbKTkw6ZE+sW1FmEk2AZQBahgG8gpLU3X6A0XYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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