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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00371b951db625b2eb7087310a7a772300cb7002b2bbf68b3e8e38d5b6bf7088' 
  AND token = '2talLOSsGWwSupeuAGYKovnBedyWexd7YflByo1Nj40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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