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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9957b88faed7ab53125f47de1807960075e15292d63e48cf1a812ffffdf7419' 
  AND token = '5y3gYRM9DvqQvcNdVULS+Y7c7NOS10m//AWBRwR+aOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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