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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babb351416ce24fdf98db9882e48d9bfb68ed112c50250f06de1ed95dc70b378' 
  AND token = '1MAbta8PCmoFo7cbIbCouP83KBs/5H9AO004AvXX/0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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