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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf399a385141b9c5f7e84c2fdce14bd1e7f930965226a92dcfe3e65ad19aca4d' 
  AND token = 'H8fmhcoOI6zqNl5cv+bTreMGtLhCRMDvN8tX1lXafu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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