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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1b7ffa6c36deff5c2245ba418f90bd65a627ebf630f81c1a645c230fc10323' 
  AND token = '+NjAZ7fT86FbVOjT/NWEPa5030rTb9RzcsUQW4vuneo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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