SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a73d8c061338b868679653a1d4eb3f8c1926306a78542b729fe67242242115' 
  AND token = 'V4N4xy46K2Yrp+BdbD9HkxjJGaViZgV/z7mFJfuWSpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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