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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70a72ee957109c154dc85befd44e224e94357e3b57fea6ba61a2b00488ae504' 
  AND token = 'fdAh9Z547K33EpzMfLHqQyx+dXU7dAaSBxCdeEiAIWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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