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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ae40acf104d588a6f9f1390880c229e8e48fd2465626c00b16840c4ccd9f9e' 
  AND token = '93ScW/QBCCIDyiegQkFAr6cA2ztirVETsr5PqsjidB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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