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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44efbd2714db9b568d217092d6d6e8a776b27c7eb1292d3ca180053ef7b714de' 
  AND token = 'E4IzfKBb2l8P2CSRre+9DM5lXdu0H6TyEU8Ln//qgQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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