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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c739f689a20b78f136b4639706593472505778bee42276b0c99c813de49617' 
  AND token = 'XMu2dCfBeiZZizuM0+n1wIVf6k1Bc1yCI8CVcMnlPo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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