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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cf849a5a8cd7bd1cae057494e476b117e95ed9c4273598528927176cfe2bbe' 
  AND token = 'ZslPsPiYqCC1IFEhjMBcltp2n26n4S/G5ujWnolR6a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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