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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24dfe0345131949fcd409c42c92adce3240638b8d8f808b61288bf07408e7f8f' 
  AND token = 'xIvRD3k3qmZcR8nzjrU2BKXkoboBPxNR9zyPprjB9ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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