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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f8c66dfd2acc6b8765060f8394b0d6a9d388049ad7ab993afb96446c6e9a37' 
  AND token = 'qizsyps0pvDpIqPY0Epyldt0I57eHicDqNd548ixxxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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