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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cb166fc2bb72af9f6db2026641f77e40e57c2f85fadb16a9beba85a5db2b81' 
  AND token = 'bSKKt37Tir2rTRAhQMZaReF9NV9XR+pavuo76Ap77Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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