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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc00506ca9727c8a0b47a1c0ec6102fdc1fe1f594d49bd84bbcc8dcbc449c39' 
  AND token = 'cYKt0JvavH/9+bp13YX5sqXxmRvRlu+VJ/zvP/6PYHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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