SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0b70da404be05f35fb806b24eab3e1448d377e972e6ca43f3d334f11599129' 
  AND token = 'Pw+p7BMy1SmhGIFOt6X5Wruwp6h5jpLnv2Sc/PLcNoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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