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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5573f758a72194ab89d6f9b20ace6ffff4e77c14aa054a53d8dae4b83f6a164c' 
  AND token = 'v4VXyNxWrYddRg6zsMNaEv0zGO949AAH7M4GGtQAqcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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