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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6fb43ee1f7d7d9df29ec1a6f62fa5f9eca45602712584f00522014b8b54d23' 
  AND token = '5P1SyG/S6ouvkBEF9E6FBbb069Tc5uEj0sARz+7yKO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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