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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33611faf940cf7e39cca736ee9b9ba6fa14086c9fa13954ae49f6f4a0c71c121' 
  AND token = 'Eko7OeW3SPplEh/YNIyUz0Uyy0hJS8a9jPOI9wBY/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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