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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3d4bd335922a6c92c51fffa6d2ac0f8836466b640bf2d546bf39226ccc221a' 
  AND token = '2t5nMFgo6aUG/5IGHSKknVKGZ56JpF0/7x25XP2NnsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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