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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219afc349b0553081185e65117721c62bd6b975d063e05f793700d3dcf63c960' 
  AND token = 'xhYID4mUecpx+xuSZp5MRVVD4d5bJzvh81RsyghMA34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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