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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e774e6635013156ddd032309dbccc422ac830551a815d9f137a716877e6736c2' 
  AND token = '2h3AascqM9McDcLxOvSd/7GxruS64elJBekhQi74n8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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