SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5824488a02d583fac854a26ac3d79dad11b87524495c8ef786f52e3fe3df5e34' 
  AND token = 'Blzm+1GfYdXmA9DPWDe+jQFV2k9WoptHoYWQ/UzGNTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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