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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e656038efca34c1e37fdb58a77e7ec6c0a092f280ca35d21e9ff691617cbf4' 
  AND token = 'DZEYMvqfx4BOE8O9PunNB+7eprwYfg1UCN1wu9Ctfkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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