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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c57a37cc66892edb6599758170605885b65a0773703fc3778a5b06fd3502c38' 
  AND token = 'ZjSdWud1iztIp03Zo4KH6hsiMENu5/kEq7QOf74sckA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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