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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e71ddccd814f678a8f1813e0a6f42536ca0afdeadb1fccf7a3ee0048b6a922' 
  AND token = 'ztvHwn9uH4AA5lUKudj2Z/4fySPcpKfO4V4ERqJf6no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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