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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f30b9970f6fa10dd4e0d6022ce9ae121558a08666d0ddd8c1b315ace412fdc9' 
  AND token = 'vers+FtiBtvlR2Fgwp6DPZmu0lX7/bfBj/bxJbQCPnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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