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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62289dce374e8bce7c7dd9b4c876d60d7ff1e3d2797faf19d68e03dc71a5e242' 
  AND token = '3dz/xnGzpvrmQrh9BGCGIomby6LA99vl++tA1ubnDXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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